class Student{
    fullName: string;
    constructor(public firstName, public middleInitial, public lastName){
        this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
}

interface Person {
    firstName: string;
    lastName: string;
}

function greeter(person: Person){
    return "Hello, " + person.firstName + " " + person.lastName;
}

let user = new Student("Tan", "M.", "Feng");